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Aviation Learning Center Document All About Fuel - P-8740-35
Author: Federal Aviation Administration Date: 2002
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The introduction of turbine-powered aircraft into the civil aircraft fleet during the 1950s caused many changes in the marketing of aircraft fuels. As the air carrier and military fleets were converted to turbine-powered aircraft, the demand for aviation gasoline (avgas) decreased drastically. Aviation fuels now represent a relatively small portion of the petroleum industry's products and, therefore, the production of avgas in multi grades is no longer economically feasible. During the past few years, we have seen 91/96, and 115/145 octane fuels disappear from the market.

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